Yoshimura YAFMS (Yoshimura Advanced Fuel Management System)

The Yoshimura YAFMS is used in conjunction with OEM electronic control module (ECM)
Adjuster box connects to stock wiring harness and communicates with your ECM
The adjuster allows you to make fuel map adjustments to the slow speed circuit and low, medium and high throttle positions on the fuel injection map
Adjustments are made with a fix position switch; additional potentiometer fine-tunes the slow-speed circuit
Adjusts fuel metering from -10% injector duration to +10% injector duration in increments of +/- 5%
Does not alter sensor input -- box adjusts ECM fuel map. This means your fuel injection will function properly at all elevations and in varying weather conditions.